Summary of Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 24, 2011	Jun. 25, 2011	Mar. 26, 2011	Dec. 29, 2012	Dec. 31, 2011	Dec. 25, 2010
Summary of Quarterly Results [Abstract]
Net sales	$ 694,307	$ 668,391	$ 677,097	$ 661,610	$ 737,777	$ 678,612	$ 676,660	$ 659,455	$ 2,701,405	$ 2,752,504	$ 2,620,378
Gross profit on sales	190,553	181,276	187,599	183,125	191,548	183,146	182,657	178,504	742,553	735,855	713,625
Net income	$ 22,103	$ 17,178	$ 23,204	$ 20,026	$ 19,300	$ 16,982	$ 20,701	$ 18,601	$ 82,511	$ 75,584	$ 68,291
Basic and diluted earnings per share	$ 0.83	$ 0.64	$ 0.86	$ 0.74	$ 0.72	$ 0.63	$ 0.77	$ 0.69	$ 3.07	$ 2.81	$ 2.54